While Chihuahuas may not be big enough to inflict much damage, I can state from a toddler's point of view (my aunt had a pack of the yipping nipping little flucks) that nothing instills fear in the heart of a toddler more than a bunch of snarling, snapping Chihuahuas rushing up and attacking your legs, ankles & feet, and I still hate that little bastid breed to this very day because of it!